Chair arm



FIG. 1 is a perspective view showing the top, left side and front of achair arm which forms my new design, the broken lines being forillustrative purposes only and forming no part of my design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view; and,

FIG. 7 is a rear elevational view thereof.

The ornamental design for a chair arm, as shown and described.